Programmable: Advanced pre-setting one week in advance. Digital electronic timer with daily programs. Repeat programs with 17 on/off settings and manual override. AC/DC: Lithium battery backup when the power supply is off. AC/DC power supply available. Automatic Error Correction: This timer has automatic error correction + 30s, weekly. With high precision and strong anti-interference ability. Easy to Mount: This timer features a panel-mounted design, which can be easily and steadily mounted on the wall. Wide Application: This timer switch can automatically turn on/off all kinds of electrical equipment according to the time set by the user. Ideal for controlling street lights, neon lights, production equipment, radio and television, and many other household appliances.